Steel retainer



STEEL RETAINER Filed Aug. 30, 1927 I m fi F a V g J Patented 9,1929. I i I LEWIS o. BAYLES,OF Ens-Ton, rnrmsrnvanis, AND en'ovnn a. 'rU'r'rLE, E rnf nnirs- Brine, EEw JEnsEY, Assienons no ir ennsonn-nenn corrranr, or JEn CITY,

nnw JEnsEY, A eonronarron or nEw JERSEY.

STEEL RETAINER.

Application filed August 30, 1927. Serial lilo. 216,398.

Thisinvention relates to rock drills, but device described in the following para- 03 more particularly to steel retainers adapted graphs: k to be applied to the front end of a hammer An enlargement Q is formedon the front type rock drill. end of the fronthead F. Y In the front of-this One object of the invention is to prevent enlargement is formed a cylindrical opening removal of the steel from the front head it having one side cut away as shown at S. 0 while the steel is being withdrawn from the A cap Thaving its outer-cylindrical surface drill hole. c U of such a size that it fits snugly in the open- Another object is to prevent ejection of t is provided with a handle V" and an 10 the steel from the front head wl ilethe drill inner cylindrical bore VJ co centric with its is in operation and a further object is to proouter cylindrical surface.

p llS bore W does 65 duce a rugged steel retainer having few parts not pass completely through the cap'T'but 'which are inexpensive to manufacture, efiiis so formed as to leave an end wall X of cient' in operationand which may be readily substantial thickness. Through the end assembled and disassembled. wall X formed a bore Y suitable forthe Other objects will be in 'part obviou's and passage of abolt Z. The belt Z has a head in part pointed out hereinafter. 72' and a shank 0. Near the headless end or tThe invention-consists of the combination the bolt Z is formed an aperture cl transverse.

.of elements and arrangement of parts 'havto the-axis of the bolt. P

ing the general mode of operation herein- At its rearward end, the cylindrical openafter described and pointed out more paring R is reduced to form an aperture 6 of 75 ticularly in the appended claims and illussuch a size that the bolt Z will fit snugly trated in the accompanying drawings, in therein. Two notches fand g are formed which in the front peripheryof thejfront head en- Figure 1 is a sectionalview in elevation largement Q. Passing through the frontof so much of a rock drill as will serve to headenlargement Q is an aperture h trans- 80 illustrate the invention, verseto the aXis of the'bolt Z. There is pro Figure 2 is a plan view of the front end'of vided a key j of suitable size to pass through a rock drill partly in section, the section be. the aperture 7a in the front head enlargement ing taken on the line 22 looking in the Q and the aperture (Z in the bolt Z, the key direction indicated by the arrows, and. having a notch y" cut in its upper edge.' as Figure 3 is an end view of arock drill The operation of the steel retainer is as looking from the front end. 7 follows Assuming that the operator Wishes Referring to the drawings, the. invention to insert a drill steel into the tool, he first is shown applied to a rock drill having a places a drill steel shank into the chuck cylinder A in which is mounted a recipro bushingE.vv Thisoperation is follo'weidby-DO. catory hammer piston B. The front'end'of inserting the cap T into the 'cylindrical the cylinder A. is closed by a front cylinder opening B. He then placesa helical spring washer C. Surroundingthe front end of the 0 around the shank of the bolt Z and inserts 40 hammcrpistonB .is a chuck D in the front the bolt Z into the aperture 6. p

end of which is secured a chuck bushing E. He next placesthe bolt head 6 in such a A front head 1* is held in place by the usual positionthat when his weight is thrown upside bolts G passing through lugs H and on the handle of; the rock drill, the spring having nuts J securelyheld in place by lock 0 will be compressed forcing the bolt Z into 45 nuts K and lock washers Tnterposed bethe hole 6 far enough so that the key mayv tween the lugs H and thenuts J are springs be inserted through the apertures h and c.

O. Extending intothe front head F is a This securely. locks the cap T, springs 0 and drill steel or working implement P having bolt Z'in place. It will be noticed, however, a collar Q. that the aperture (Z has its length slightly 50 Inthe operation of a pneumatic tool of greater than the breadth of the key This the type described, itis necessary to provide is to permit a slight amount of play or 'lonmeans for retaining the working implement gitudinal movement between the bolt-Z and in the front head. In the present invention its aperture 6. 1 V the working implement is retained by the The cap T is cut away as shown at p to por mit the collar Q of the drill steel P to pass when the drill steel is being insertedor ex tracted from the front head F; Once the drill steel has been inserted, all that is necessary to retain itin a working position is to turn the handle V to the position shown by the broken line at V. I his operation of turning the handle moves the cut-away portion 32 to the position shown by the broken line p.

The construction of the steel in the manner herein described provides avery substantial and rugged retainer. The key j-is'designed so that its shearing strength will be equal to the tensile strength of the bolt-Z. o lVhen the collar Q, of the drill steel. P is driven against the uper edge of the cap '1,

this edge will be burred to some extent. To

provide for easy turning of the cap 1 after this burring effect has taken place, an annular groove 0 is formed around the upper end of the cylindrical surface It. 'Leadin into this groove r is an oil hole a which is provided to keep thelmoving parts of the retainerwell oiled. at} all times 7 c r r It willbe-notieed thatduring the operation of the tool, a constant vibration occurs and an occasional blow from the collar "W of the drill steel'P upon the edge (I of the cap T. To

prevent the cap T from being'displaced so that the groove 39 might come into the positionshown inFigure 3 and permit the drill steel P I for securing; said cap in place, a groove in said I to be ejected from the front head, the notches f and g are cut in the front part ot the projection Q. The spring ,0 exerts a constant pressure against the cap T forcing it upward and for this reasonthe handle V will be secur ely held in the position in which it was placed by the operator regardless of the vibrationof the tool. 1 v v v VVeclaim: 3 p 1; In a pneumatic tool, the combination of a front head having ja bore adapted to receive the collared shank of a drill steel and havingan enlarged front end portion formed with a' cylindrical recess a cap in sald recess means cap adapted to permit the passage of a drill steel collar intoor outiof said front head bore;

said cap adapted to be rotated to bring said grooveinto or out oi registry with the. pe-

riphery of saidfront head bore to permit or steel andcooperating with prevent the passage of said drill steel collar into or out of said front head bore.

said front head bore.

. 3. In a pneumatic tool, the combination of" a front head having a bore adapted tojre-' ceive the collared shank of adrill steel and having an enlarged front end portion'with a cylindrical recess formed therein, acap in said-recess, 'ineans for securing said capin place, resilient meanslto absorb the impaet ot the drill steel collar upon said cap, a groove 1n Silltl cap, means forrotatlngsaid cap to d1f.-.

terent positions to-bringsaid groove into or out of registry with theperlphery of said v 2. In a pneumatic tool, the combination of a front head having a bore adapted to receive the collared shank of a drill steel and having an enlarged front end" portion with a cylina front head boreito permit orgprevent the passage of said drill steel into or out of t-hesaid front head bore and means for locking said cap in position.

4. In a pneumatic tool, the combination of a front head having aibore adapted to receive the collared shank of adrill-steel'and having an enlarged front end portion witha cylindrical recess formed'th'erein, a'cap in said recess, means for securing said cap in place,.

said means comp ising a bolt; an aperture through the shank of 'sai'dboltland a' key passing through an aperture in said front head and through the'ape rture in said bolt, resilient meansdisposed in said cap between said'cap and the head of said bolt said resilient-insane absorbing blows of said drill the bolt in position.

;=In testimony specification.

whereof we have signed this said key to hold Lewis o. narrlnsf I enovna e TUrrLn. 

